Registration Dossier
Registration Dossier
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EC number: 223-989-2 | CAS number: 4156-21-2
PBT assessment
Administrative data
PBT assessment: overall result
- PBT status:
- the substance is not PBT / vPvB
- Justification:
The available tests to asses the degradation behaviour of the test item in the aquatic environment shows that the substance is not readily biodegradable nor inherently biodegradable. The main degradation way in the environment is the hydrolysis in water. A test according OECD Guideline No 111 shows a half life of 5 days at pH 7 and 20 °C. This corresponds to a half life of 9.45 days at pH 7 and 12 °C.
The indirect photolysis of the test item was estimated with the QSAR program AOP (v1.92) from US EPA. The estimation calculates reaction with hydroxyl radicals. As result a half-life of 4 hours is reported which demonstrate a rapid degradation of the substance in contact with hydroxyl radicals.
Ecotoxicological information from the possible degradation products is not available. Looking at the structure its is clear that the hydrolysis occur at the chlorides as part of the 1,3,5-triazin substructure. A literature search offers some information about cyanuric chloride and cyanuric acid and shows, that both substances are not toxic to the environment. In water cyanuric chloride hydrolyses quickly to cyanuric acid via the intermediates 2,4-dichloro-6-hydroxy-s-triazine and 2-chloro-4,6-dihydroxy-s-triazine (DT50 < 5 hours).
The test item is not toxic to the environment. It is very likely that the degradation products are also not toxic to the environment.
The ‘P’ criterion according to Annex XIII is NOT fulfilled for environmental compartments.
The experimental identified Log Kow is -0.48 and therefore << 4.5.
The ‘B’ criterion for the substance is NOT fulfilled.
The Long-term toxicity NOEC to daphnia is 143 mg/L
The 'T' criterion for the substance based on the lowest long-term toxicity result is NOT fulfilled (NOEC 21-d Dapnia 143 mg/L).
For the substance sodium p-[(4,6-dichloro-1,3,5-triazin-2-yl)amino]benzenesulphonate neither the ‘P’ criterion nor the ‘B’ and ‘T’ criteria are fulfilled. Therefore the substance is neither ‘PBT' nor a 'vPvB' substance.
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